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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "chartdatetimeaxisx_p.h"
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#include "chartpresenter_p.h"
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#include "qdatetimeaxis.h"
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#include <QGraphicsLayout>
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#include <QDateTime>
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#include <QFontMetrics>
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#include <qmath.h>
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static int label_padding = 5;
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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ChartDateTimeAxisX::ChartDateTimeAxisX(QAbstractAxis *axis, ChartPresenter *presenter)
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: ChartAxis(axis, presenter),
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m_tickCount(0)
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{
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}
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ChartDateTimeAxisX::~ChartDateTimeAxisX()
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{
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}
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void ChartDateTimeAxisX::createLabels(QStringList &labels, qreal min, qreal max, int ticks)
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{
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Q_ASSERT(max > min);
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Q_ASSERT(ticks > 1);
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QDateTimeAxis *axis = qobject_cast<QDateTimeAxis *>(m_chartAxis);
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int n = qMax(int(-floor(log10((max - min) / (ticks - 1)))), 0);
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n++;
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for (int i = 0; i < ticks; i++) {
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qreal value = min + (i * (max - min) / (ticks - 1));
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labels << QDateTime::fromMSecsSinceEpoch(value).toString(axis->format());
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}
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}
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QVector<qreal> ChartDateTimeAxisX::calculateLayout() const
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{
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Q_ASSERT(m_tickCount >= 2);
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QVector<qreal> points;
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points.resize(m_tickCount);
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QRectF rect = presenter()->chartsGeometry();
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const qreal deltaX = rect.width() / (m_tickCount - 1);
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for (int i = 0; i < m_tickCount; ++i) {
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int x = i * deltaX + rect.left();
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points[i] = x;
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}
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return points;
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}
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void ChartDateTimeAxisX::updateGeometry()
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{
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const QVector<qreal>& layout = ChartAxis::layout();
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if (layout.isEmpty())
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return;
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QStringList ticksList;
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createLabels(ticksList, m_min, m_max, layout.size());
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QList<QGraphicsItem *> lines = m_grid->childItems();
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QList<QGraphicsItem *> labels = m_labels->childItems();
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QList<QGraphicsItem *> shades = m_shades->childItems();
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QList<QGraphicsItem *> axis = m_arrow->childItems();
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Q_ASSERT(labels.size() == ticksList.size());
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Q_ASSERT(layout.size() == ticksList.size());
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QRectF chartRect = presenter()->chartsGeometry();
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QGraphicsLineItem *lineItem = static_cast<QGraphicsLineItem *>(axis.at(0));
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lineItem->setLine(chartRect.left(), chartRect.bottom(), chartRect.right(), chartRect.bottom());
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qreal width = 0;
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for (int i = 0; i < layout.size(); ++i) {
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QGraphicsLineItem *lineItem = static_cast<QGraphicsLineItem *>(lines.at(i));
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lineItem->setLine(layout[i], chartRect.top(), layout[i], chartRect.bottom());
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QGraphicsSimpleTextItem *labelItem = static_cast<QGraphicsSimpleTextItem *>(labels.at(i));
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labelItem->setText(ticksList.at(i));
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const QRectF &rect = labelItem->boundingRect();
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QPointF center = rect.center();
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labelItem->setTransformOriginPoint(center.x(), center.y());
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labelItem->setPos(layout[i] - center.x(), chartRect.bottom() + label_padding);
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if (labelItem->pos().x() <= width) {
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labelItem->setVisible(false);
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lineItem->setVisible(false);
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} else {
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labelItem->setVisible(true);
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lineItem->setVisible(true);
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width = rect.width() + labelItem->pos().x();
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}
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if ((i + 1) % 2 && i > 1) {
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QGraphicsRectItem *rectItem = static_cast<QGraphicsRectItem *>(shades.at(i / 2 - 1));
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rectItem->setRect(layout[i - 1], chartRect.top(), layout[i] - layout[i - 1], chartRect.height());
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}
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lineItem = static_cast<QGraphicsLineItem *>(axis.at(i + 1));
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lineItem->setLine(layout[i], chartRect.bottom(), layout[i], chartRect.bottom() + 5);
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}
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}
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void ChartDateTimeAxisX::handleAxisUpdated()
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{
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//TODO:: fix this
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QDateTimeAxis *axis = qobject_cast<QDateTimeAxis *>(m_chartAxis);
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m_tickCount = axis->tickCount();
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ChartAxis::handleAxisUpdated();
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}
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QSizeF ChartDateTimeAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
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{
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Q_UNUSED(constraint)
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QFontMetrics fn(m_font);
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QSizeF sh;
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switch (which) {
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case Qt::MinimumSize:
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sh = QSizeF(fn.boundingRect("...").width(), fn.height());
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break;
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case Qt::PreferredSize: {
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const QVector<qreal>& layout = ChartAxis::layout();
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if (layout.isEmpty())
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break;
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QStringList ticksList;
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qreal width = 0;
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qreal height = 0;
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for (int i = 0; i < ticksList.size(); ++i) {
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QRectF rect = fn.boundingRect(ticksList.at(i));
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width += rect.width();
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height += qMax(rect.height() + label_padding, height);
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}
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sh = QSizeF(width, height);
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break;
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}
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default:
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break;
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}
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return sh;
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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